A dry line set up over the eastern panhandles during the afternoon, with dew point temperatures in the middle to upper 60s east of the boundary. Afternoon heating and lift from an upper level disturbance allowed for thunderstorms to develop east of the dry line. The thunderstorms moved into western and northwestern Oklahoma by the afternoon, mainly north of Interstate 40. Supercell thunderstorms dropped very large hail as they moved northeast toward the Kansas border. Another cluster of thunderstorms moved northeast toward parts of central and northern Oklahoma. Large hail up to golf ball size, damaging winds near 70 mph, and very heavy rainfall were reported with the complex. Damage to trees and power lines was reported as the thunderstorms passed. The thunderstorms finally moved into Kansas during the late night hours. Monetary damages were estimated.